Reaming collar for drill steels



Aug. 19, 1952 ALGER 2,607,561

REAMING COLLAR FOR DRILL STEELS Filed May 2, 194 9 W7 'nml INVENTOR. I JoH/v AL @152 BYW Patented Aug. 19, 1952 UNITEDSTATES PATENT OFFICE;

;"2,607,561 I v REAMING COLLAR FOR. DRILL STEELS John Alger, Lakewood, c010. Applicatio nMay 2, 1949, Serial No. 90,926

' sclaims. (01.255-61) This invention relates to an attachment'for rock drilling steels. When drilling relatively deep, vertical holes, the air exhaust from the bit of the drill steel is unableto raise the rock dust to the top of the hole. This dust therefore accumulates in a packed dust rin about the drill steel above the bit. When the drill steel is drawn upwardly for removal from the hole, the enlarged bit extremity becomes wedged into this dust ring with sufficient force to prevent rotation of the drill steel and withdrawal of the latter.

The principal object of this invention is to provide a simple, easily applied attachment for a drill steel which will act to quickly remove this dust ring as the steel is withdrawn'from the hole so as to prevent loss of the steel, f

Another object of the invention is to so construct'the attachment that no changes of any kind need be made in the conventional drill steel or bit, and to provide an attachment for'this purpose which can be applied to the drill steel either before or after its insertion in the drill hole.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efliciency. These will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a side view of the bit extremity of a conventional drill steel, illustrating it in place in a drill hole with the improved attachment in place thereon;

Fig. 2 is a plan view of the improved dust ring removing attachment; and

Fig. 3 is a cross-section through an alternate form of the attachment, taken on the line 3-3, Fig. 4;

Fig. 4 is a side view of the alternate form of Fig. 3.

In Fig. 1 a conventional, hexagonal drill steel is illustrated at ID, with its bottom bell II and with a conventional drill bit applied thereto, as indicated at I 2.

In Fig. 1 the steel and bit are in place in a drill hole I3 in which a dust ring I 4 has been built up by the air discharge through the bit I2. This dust ring is the result of the powdered dust, created by the drilling action, being blown upwardly by the air exhaust and bit.

The improved attachment comprises two relatively thin, metallic, half .shells I5 and I6 secured together by means of removable pins II passing through interlocking pin sleeves I8 which are formed on the adjacent edges of the shell I6.- A plurality of cutting blades I9 are welded or otherwise secured to the upper/ex tremities of the shells I5 and I6 and project radially outward therefrom. The length of the blades is sufficient to approximately equal the radius of the drill steel bottom bell II. The leading edges of the blades I9 are inclined rearwardly to present a relatively sharp cutting edge.

The sizes and shapes of the shells are such that when together they will enclose the hexagonal-drill steel I0 rather loosely so that the complete attachment may slide from end to end of the drill steel. When drilling deep holes, exceeding ten feet in depth, the attachment is applied to the drill steel immediately above the bell II before the steel is inserted, since the dust ring I4 can be anticipated in deep holes.

The device is applied by simply placing the two shells I5 and I6 on opposite sides of the drill steel and forcing them together to align the sleeves l8. The pins I I are then forced into place. I

The improved dust ring removing attachment does not interfere in any way with the drilling operation and, when the drill steel is lifted and rotated, the sharpened blades I9 will rapidly scrape away the dust ring I4 to clear a passage for the bell I l and the bit I2. The loosened dust from the ring will either be blown from the hole by the air discharge or will fall to the bottom of the hole.

In cases where the attachment was not applied in advance and a drill steel has become stuck due to a dust ring. it can be applied to the steel above the hole with the blades I9 positioned on the bottom edge, and then allowed to Slide down into the hole under the combined action of the vibration and rotation of the drill steel. As the attachment slides down the steel it will rapidly cut its way through the dust ring, allowing easy removal of the drill steel.

In Fig. 3 an alternate method of attaching the device is illustrated. Two half shells 20 and 2| are employed, similar to the previously described shells l5 and I6. In this form, however. each shell i provided with a relatively thick, overlapping edge 22 which is notched to extend over a relatively thin edge 23 on the opposite through the drill steel 3 section. The two edges 22 and 23 are then secured together by means of headless set screws 24. This form carries cutting blades l9 and operates exactly the same as the previously described form. I 7

While a specific form of the improvement has been described and illustrated herein, it is to be understood that the same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent,

steel having a conventional-drill bit comprising:

1. A dust ring removing attachment forya drill; Q

two half shells shaped so that\ when together,

they will surround the drill steel; interlocking pin sleeves along the adjacent edges of said shells; locking pins extending through "said sleeves to lock said shells about a drill steel; and Cutting blades projecting radially outward from than the radiusof the drillbit.

-2. A dust ring removing attachment for a drill s'teelhavin'g a conventional drill bit comprising: two half shells shaped so that when together, they wilLsurround the drill -steel,.one extremity of each shell overlapping the adjacent extremity said shells the radius of said blades being less of the other-shell; means forsecuring the over 4 to the axis thereof the radial length of said blades being less than the radius of said drill bit so that said blades will engage and remove any dust ring which may tend to reduce the diameter of the hole drilled by said bit.

4. A dust ring removing attachment for a hexagonal drill steel as described in claim 3, in which the diameter of a circle described by the extremities of said blades when said shell is rotated is less than the diameter of the hole drilled'by said drill bit.

5. The combination of a hexagonal drill steel; a drill bit of larger diameter than said steel mounted on the extremity of said steel and adapted to drill a hole about said steel; a removable hexagonal shell formed from two hinged together halves encircling said steel adjacent said 'bit, the 'coa'ctin'g hexagonal shapes of the steel to said wall without increasing the diameter of said hole.

JOHN ALGER;

, a w The following references are 'of i'ecord in the file of this patent: I

UNITED STATES PATENTS 

